Template:Williston, 1891

• Williston, S.W. 1891. Family Syrphidae. Pp. 1–79. In: Godman, F.D. & O. Salvin, eds., Biologia Centrali-Americana. Insecta. Diptera, vol. 3, 127 pp. hdl: 2027/uc1.c037123260 [public domain in U.S.]  
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References

• Thompson, F.C. 1997. Revision of the Eristalis flower flies (Diptera: Syrphidae) of the Americas South of the United States. Proceedings of the Entomological Society of Washington 99(2): 209–237. hdl: 10088/17085 BHL Reference page.